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 * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package jdk.graal.compiler.core.common.cfg;

import java.util.BitSet;

public class BasicBlockSet {

    private BitSet set;
    private final AbstractControlFlowGraph<?> cfg;
    private int count;

    protected BasicBlockSet(AbstractControlFlowGraph<?> cfg) {
        this.cfg = cfg;
    }

    public boolean get(BasicBlock<?> b) {
        if (set == null) {
            return false;
        } else {
            return set.get(b.getId());
        }
    }

    public void set(BasicBlock<?> b) {
        if (!get(b)) {
            if (set == null) {
                set = new BitSet(cfg.getBlocks().length);
            }
            count++;
            set.set(b.getId());
        }
    }

    public int count() {
        return count;
    }
}
